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SLUB: Fix memory leak by not reusing cpu_slab
[pv_ops_mirror.git] / drivers / net / iseries_veth.c
blob97bd9dc2e52e8a2aa1f42ef764e5119e53dc8aba
1 /* File veth.c created by Kyle A. Lucke on Mon Aug 7 2000. */
2 /*
3 * IBM eServer iSeries Virtual Ethernet Device Driver
4 * Copyright (C) 2001 Kyle A. Lucke (klucke@us.ibm.com), IBM Corp.
5 * Substantially cleaned up by:
6 * Copyright (C) 2003 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
7 * Copyright (C) 2004-2005 Michael Ellerman, IBM Corporation.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of the
12 * License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
22 * USA
23 *
24 *
25 * This module implements the virtual ethernet device for iSeries LPAR
26 * Linux. It uses hypervisor message passing to implement an
27 * ethernet-like network device communicating between partitions on
28 * the iSeries.
29 *
30 * The iSeries LPAR hypervisor currently allows for up to 16 different
31 * virtual ethernets. These are all dynamically configurable on
32 * OS/400 partitions, but dynamic configuration is not supported under
33 * Linux yet. An ethXX network device will be created for each
34 * virtual ethernet this partition is connected to.
35 *
36 * - This driver is responsible for routing packets to and from other
37 * partitions. The MAC addresses used by the virtual ethernets
38 * contains meaning and must not be modified.
39 *
40 * - Having 2 virtual ethernets to the same remote partition DOES NOT
41 * double the available bandwidth. The 2 devices will share the
42 * available hypervisor bandwidth.
43 *
44 * - If you send a packet to your own mac address, it will just be
45 * dropped, you won't get it on the receive side.
46 *
47 * - Multicast is implemented by sending the frame frame to every
48 * other partition. It is the responsibility of the receiving
49 * partition to filter the addresses desired.
50 *
51 * Tunable parameters:
52 *
53 * VETH_NUMBUFFERS: This compile time option defaults to 120. It
54 * controls how much memory Linux will allocate per remote partition
55 * it is communicating with. It can be thought of as the maximum
56 * number of packets outstanding to a remote partition at a time.
57 */
58
59 #include <linux/module.h>
60 #include <linux/types.h>
61 #include <linux/errno.h>
62 #include <linux/ioport.h>
63 #include <linux/kernel.h>
64 #include <linux/netdevice.h>
65 #include <linux/etherdevice.h>
66 #include <linux/skbuff.h>
67 #include <linux/init.h>
68 #include <linux/delay.h>
69 #include <linux/mm.h>
70 #include <linux/ethtool.h>
71 #include <linux/if_ether.h>
72
73 #include <asm/abs_addr.h>
74 #include <asm/iseries/mf.h>
75 #include <asm/uaccess.h>
76 #include <asm/firmware.h>
77 #include <asm/iseries/hv_lp_config.h>
78 #include <asm/iseries/hv_types.h>
79 #include <asm/iseries/hv_lp_event.h>
80 #include <asm/iommu.h>
81 #include <asm/vio.h>
82
83 #undef DEBUG
84
85 MODULE_AUTHOR("Kyle Lucke <klucke@us.ibm.com>");
86 MODULE_DESCRIPTION("iSeries Virtual ethernet driver");
87 MODULE_LICENSE("GPL");
88
89 #define VETH_EVENT_CAP (0)
90 #define VETH_EVENT_FRAMES (1)
91 #define VETH_EVENT_MONITOR (2)
92 #define VETH_EVENT_FRAMES_ACK (3)
93
94 #define VETH_MAX_ACKS_PER_MSG (20)
95 #define VETH_MAX_FRAMES_PER_MSG (6)
96
97 struct veth_frames_data {
98 u32 addr[VETH_MAX_FRAMES_PER_MSG];
99 u16 len[VETH_MAX_FRAMES_PER_MSG];
100 u32 eofmask;
101 };
102 #define VETH_EOF_SHIFT (32-VETH_MAX_FRAMES_PER_MSG)
103
104 struct veth_frames_ack_data {
105 u16 token[VETH_MAX_ACKS_PER_MSG];
106 };
107
108 struct veth_cap_data {
109 u8 caps_version;
110 u8 rsvd1;
111 u16 num_buffers;
112 u16 ack_threshold;
113 u16 rsvd2;
114 u32 ack_timeout;
115 u32 rsvd3;
116 u64 rsvd4[3];
117 };
118
119 struct veth_lpevent {
120 struct HvLpEvent base_event;
121 union {
122 struct veth_cap_data caps_data;
123 struct veth_frames_data frames_data;
124 struct veth_frames_ack_data frames_ack_data;
125 } u;
126
127 };
128
129 #define DRV_NAME "iseries_veth"
130 #define DRV_VERSION "2.0"
131
132 #define VETH_NUMBUFFERS (120)
133 #define VETH_ACKTIMEOUT (1000000) /* microseconds */
134 #define VETH_MAX_MCAST (12)
135
136 #define VETH_MAX_MTU (9000)
137
138 #if VETH_NUMBUFFERS < 10
139 #define ACK_THRESHOLD (1)
140 #elif VETH_NUMBUFFERS < 20
141 #define ACK_THRESHOLD (4)
142 #elif VETH_NUMBUFFERS < 40
143 #define ACK_THRESHOLD (10)
144 #else
145 #define ACK_THRESHOLD (20)
146 #endif
147
148 #define VETH_STATE_SHUTDOWN (0x0001)
149 #define VETH_STATE_OPEN (0x0002)
150 #define VETH_STATE_RESET (0x0004)
151 #define VETH_STATE_SENTMON (0x0008)
152 #define VETH_STATE_SENTCAPS (0x0010)
153 #define VETH_STATE_GOTCAPACK (0x0020)
154 #define VETH_STATE_GOTCAPS (0x0040)
155 #define VETH_STATE_SENTCAPACK (0x0080)
156 #define VETH_STATE_READY (0x0100)
157
158 struct veth_msg {
159 struct veth_msg *next;
160 struct veth_frames_data data;
161 int token;
162 int in_use;
163 struct sk_buff *skb;
164 struct device *dev;
165 };
166
167 struct veth_lpar_connection {
168 HvLpIndex remote_lp;
169 struct delayed_work statemachine_wq;
170 struct veth_msg *msgs;
171 int num_events;
172 struct veth_cap_data local_caps;
173
174 struct kobject kobject;
175 struct timer_list ack_timer;
176
177 struct timer_list reset_timer;
178 unsigned int reset_timeout;
179 unsigned long last_contact;
180 int outstanding_tx;
181
182 spinlock_t lock;
183 unsigned long state;
184 HvLpInstanceId src_inst;
185 HvLpInstanceId dst_inst;
186 struct veth_lpevent cap_event, cap_ack_event;
187 u16 pending_acks[VETH_MAX_ACKS_PER_MSG];
188 u32 num_pending_acks;
189
190 int num_ack_events;
191 struct veth_cap_data remote_caps;
192 u32 ack_timeout;
193
194 struct veth_msg *msg_stack_head;
195 };
196
197 struct veth_port {
198 struct device *dev;
199 u64 mac_addr;
200 HvLpIndexMap lpar_map;
201
202 /* queue_lock protects the stopped_map and dev's queue. */
203 spinlock_t queue_lock;
204 HvLpIndexMap stopped_map;
205
206 /* mcast_gate protects promiscuous, num_mcast & mcast_addr. */
207 rwlock_t mcast_gate;
208 int promiscuous;
209 int num_mcast;
210 u64 mcast_addr[VETH_MAX_MCAST];
211
212 struct kobject kobject;
213 };
214
215 static HvLpIndex this_lp;
216 static struct veth_lpar_connection *veth_cnx[HVMAXARCHITECTEDLPS]; /* = 0 */
217 static struct net_device *veth_dev[HVMAXARCHITECTEDVIRTUALLANS]; /* = 0 */
218
219 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev);
220 static void veth_recycle_msg(struct veth_lpar_connection *, struct veth_msg *);
221 static void veth_wake_queues(struct veth_lpar_connection *cnx);
222 static void veth_stop_queues(struct veth_lpar_connection *cnx);
223 static void veth_receive(struct veth_lpar_connection *, struct veth_lpevent *);
224 static void veth_release_connection(struct kobject *kobject);
225 static void veth_timed_ack(unsigned long ptr);
226 static void veth_timed_reset(unsigned long ptr);
227
228 /*
229 * Utility functions
230 */
231
232 #define veth_info(fmt, args...) \
233 printk(KERN_INFO DRV_NAME ": " fmt, ## args)
234
235 #define veth_error(fmt, args...) \
236 printk(KERN_ERR DRV_NAME ": Error: " fmt, ## args)
237
238 #ifdef DEBUG
239 #define veth_debug(fmt, args...) \
240 printk(KERN_DEBUG DRV_NAME ": " fmt, ## args)
241 #else
242 #define veth_debug(fmt, args...) do {} while (0)
243 #endif
244
245 /* You must hold the connection's lock when you call this function. */
246 static inline void veth_stack_push(struct veth_lpar_connection *cnx,
247 struct veth_msg *msg)
248 {
249 msg->next = cnx->msg_stack_head;
250 cnx->msg_stack_head = msg;
251 }
252
253 /* You must hold the connection's lock when you call this function. */
254 static inline struct veth_msg *veth_stack_pop(struct veth_lpar_connection *cnx)
255 {
256 struct veth_msg *msg;
257
258 msg = cnx->msg_stack_head;
259 if (msg)
260 cnx->msg_stack_head = cnx->msg_stack_head->next;
261
262 return msg;
263 }
264
265 /* You must hold the connection's lock when you call this function. */
266 static inline int veth_stack_is_empty(struct veth_lpar_connection *cnx)
267 {
268 return cnx->msg_stack_head == NULL;
269 }
270
271 static inline HvLpEvent_Rc
272 veth_signalevent(struct veth_lpar_connection *cnx, u16 subtype,
273 HvLpEvent_AckInd ackind, HvLpEvent_AckType acktype,
274 u64 token,
275 u64 data1, u64 data2, u64 data3, u64 data4, u64 data5)
276 {
277 return HvCallEvent_signalLpEventFast(cnx->remote_lp,
278 HvLpEvent_Type_VirtualLan,
279 subtype, ackind, acktype,
280 cnx->src_inst,
281 cnx->dst_inst,
282 token, data1, data2, data3,
283 data4, data5);
284 }
285
286 static inline HvLpEvent_Rc veth_signaldata(struct veth_lpar_connection *cnx,
287 u16 subtype, u64 token, void *data)
288 {
289 u64 *p = (u64 *) data;
290
291 return veth_signalevent(cnx, subtype, HvLpEvent_AckInd_NoAck,
292 HvLpEvent_AckType_ImmediateAck,
293 token, p[0], p[1], p[2], p[3], p[4]);
294 }
295
296 struct veth_allocation {
297 struct completion c;
298 int num;
299 };
300
301 static void veth_complete_allocation(void *parm, int number)
302 {
303 struct veth_allocation *vc = (struct veth_allocation *)parm;
304
305 vc->num = number;
306 complete(&vc->c);
307 }
308
309 static int veth_allocate_events(HvLpIndex rlp, int number)
310 {
311 struct veth_allocation vc = { COMPLETION_INITIALIZER(vc.c), 0 };
312
313 mf_allocate_lp_events(rlp, HvLpEvent_Type_VirtualLan,
314 sizeof(struct veth_lpevent), number,
315 &veth_complete_allocation, &vc);
316 wait_for_completion(&vc.c);
317
318 return vc.num;
319 }
320
321 /*
322 * sysfs support
323 */
324
325 struct veth_cnx_attribute {
326 struct attribute attr;
327 ssize_t (*show)(struct veth_lpar_connection *, char *buf);
328 ssize_t (*store)(struct veth_lpar_connection *, const char *buf);
329 };
330
331 static ssize_t veth_cnx_attribute_show(struct kobject *kobj,
332 struct attribute *attr, char *buf)
333 {
334 struct veth_cnx_attribute *cnx_attr;
335 struct veth_lpar_connection *cnx;
336
337 cnx_attr = container_of(attr, struct veth_cnx_attribute, attr);
338 cnx = container_of(kobj, struct veth_lpar_connection, kobject);
339
340 if (!cnx_attr->show)
341 return -EIO;
342
343 return cnx_attr->show(cnx, buf);
344 }
345
346 #define CUSTOM_CNX_ATTR(_name, _format, _expression) \
347 static ssize_t _name##_show(struct veth_lpar_connection *cnx, char *buf)\
348 { \
349 return sprintf(buf, _format, _expression); \
350 } \
351 struct veth_cnx_attribute veth_cnx_attr_##_name = __ATTR_RO(_name)
352
353 #define SIMPLE_CNX_ATTR(_name) \
354 CUSTOM_CNX_ATTR(_name, "%lu\n", (unsigned long)cnx->_name)
355
356 SIMPLE_CNX_ATTR(outstanding_tx);
357 SIMPLE_CNX_ATTR(remote_lp);
358 SIMPLE_CNX_ATTR(num_events);
359 SIMPLE_CNX_ATTR(src_inst);
360 SIMPLE_CNX_ATTR(dst_inst);
361 SIMPLE_CNX_ATTR(num_pending_acks);
362 SIMPLE_CNX_ATTR(num_ack_events);
363 CUSTOM_CNX_ATTR(ack_timeout, "%d\n", jiffies_to_msecs(cnx->ack_timeout));
364 CUSTOM_CNX_ATTR(reset_timeout, "%d\n", jiffies_to_msecs(cnx->reset_timeout));
365 CUSTOM_CNX_ATTR(state, "0x%.4lX\n", cnx->state);
366 CUSTOM_CNX_ATTR(last_contact, "%d\n", cnx->last_contact ?
367 jiffies_to_msecs(jiffies - cnx->last_contact) : 0);
368
369 #define GET_CNX_ATTR(_name) (&veth_cnx_attr_##_name.attr)
370
371 static struct attribute *veth_cnx_default_attrs[] = {
372 GET_CNX_ATTR(outstanding_tx),
373 GET_CNX_ATTR(remote_lp),
374 GET_CNX_ATTR(num_events),
375 GET_CNX_ATTR(reset_timeout),
376 GET_CNX_ATTR(last_contact),
377 GET_CNX_ATTR(state),
378 GET_CNX_ATTR(src_inst),
379 GET_CNX_ATTR(dst_inst),
380 GET_CNX_ATTR(num_pending_acks),
381 GET_CNX_ATTR(num_ack_events),
382 GET_CNX_ATTR(ack_timeout),
383 NULL
384 };
385
386 static struct sysfs_ops veth_cnx_sysfs_ops = {
387 .show = veth_cnx_attribute_show
388 };
389
390 static struct kobj_type veth_lpar_connection_ktype = {
391 .release = veth_release_connection,
392 .sysfs_ops = &veth_cnx_sysfs_ops,
393 .default_attrs = veth_cnx_default_attrs
394 };
395
396 struct veth_port_attribute {
397 struct attribute attr;
398 ssize_t (*show)(struct veth_port *, char *buf);
399 ssize_t (*store)(struct veth_port *, const char *buf);
400 };
401
402 static ssize_t veth_port_attribute_show(struct kobject *kobj,
403 struct attribute *attr, char *buf)
404 {
405 struct veth_port_attribute *port_attr;
406 struct veth_port *port;
407
408 port_attr = container_of(attr, struct veth_port_attribute, attr);
409 port = container_of(kobj, struct veth_port, kobject);
410
411 if (!port_attr->show)
412 return -EIO;
413
414 return port_attr->show(port, buf);
415 }
416
417 #define CUSTOM_PORT_ATTR(_name, _format, _expression) \
418 static ssize_t _name##_show(struct veth_port *port, char *buf) \
419 { \
420 return sprintf(buf, _format, _expression); \
421 } \
422 struct veth_port_attribute veth_port_attr_##_name = __ATTR_RO(_name)
423
424 #define SIMPLE_PORT_ATTR(_name) \
425 CUSTOM_PORT_ATTR(_name, "%lu\n", (unsigned long)port->_name)
426
427 SIMPLE_PORT_ATTR(promiscuous);
428 SIMPLE_PORT_ATTR(num_mcast);
429 CUSTOM_PORT_ATTR(lpar_map, "0x%X\n", port->lpar_map);
430 CUSTOM_PORT_ATTR(stopped_map, "0x%X\n", port->stopped_map);
431 CUSTOM_PORT_ATTR(mac_addr, "0x%lX\n", port->mac_addr);
432
433 #define GET_PORT_ATTR(_name) (&veth_port_attr_##_name.attr)
434 static struct attribute *veth_port_default_attrs[] = {
435 GET_PORT_ATTR(mac_addr),
436 GET_PORT_ATTR(lpar_map),
437 GET_PORT_ATTR(stopped_map),
438 GET_PORT_ATTR(promiscuous),
439 GET_PORT_ATTR(num_mcast),
440 NULL
441 };
442
443 static struct sysfs_ops veth_port_sysfs_ops = {
444 .show = veth_port_attribute_show
445 };
446
447 static struct kobj_type veth_port_ktype = {
448 .sysfs_ops = &veth_port_sysfs_ops,
449 .default_attrs = veth_port_default_attrs
450 };
451
452 /*
453 * LPAR connection code
454 */
455
456 static inline void veth_kick_statemachine(struct veth_lpar_connection *cnx)
457 {
458 schedule_delayed_work(&cnx->statemachine_wq, 0);
459 }
460
461 static void veth_take_cap(struct veth_lpar_connection *cnx,
462 struct veth_lpevent *event)
463 {
464 unsigned long flags;
465
466 spin_lock_irqsave(&cnx->lock, flags);
467 /* Receiving caps may mean the other end has just come up, so
468 * we need to reload the instance ID of the far end */
469 cnx->dst_inst =
470 HvCallEvent_getTargetLpInstanceId(cnx->remote_lp,
471 HvLpEvent_Type_VirtualLan);
472
473 if (cnx->state & VETH_STATE_GOTCAPS) {
474 veth_error("Received a second capabilities from LPAR %d.\n",
475 cnx->remote_lp);
476 event->base_event.xRc = HvLpEvent_Rc_BufferNotAvailable;
477 HvCallEvent_ackLpEvent((struct HvLpEvent *) event);
478 } else {
479 memcpy(&cnx->cap_event, event, sizeof(cnx->cap_event));
480 cnx->state |= VETH_STATE_GOTCAPS;
481 veth_kick_statemachine(cnx);
482 }
483 spin_unlock_irqrestore(&cnx->lock, flags);
484 }
485
486 static void veth_take_cap_ack(struct veth_lpar_connection *cnx,
487 struct veth_lpevent *event)
488 {
489 unsigned long flags;
490
491 spin_lock_irqsave(&cnx->lock, flags);
492 if (cnx->state & VETH_STATE_GOTCAPACK) {
493 veth_error("Received a second capabilities ack from LPAR %d.\n",
494 cnx->remote_lp);
495 } else {
496 memcpy(&cnx->cap_ack_event, event,
497 sizeof(&cnx->cap_ack_event));
498 cnx->state |= VETH_STATE_GOTCAPACK;
499 veth_kick_statemachine(cnx);
500 }
501 spin_unlock_irqrestore(&cnx->lock, flags);
502 }
503
504 static void veth_take_monitor_ack(struct veth_lpar_connection *cnx,
505 struct veth_lpevent *event)
506 {
507 unsigned long flags;
508
509 spin_lock_irqsave(&cnx->lock, flags);
510 veth_debug("cnx %d: lost connection.\n", cnx->remote_lp);
511
512 /* Avoid kicking the statemachine once we're shutdown.
513 * It's unnecessary and it could break veth_stop_connection(). */
514
515 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
516 cnx->state |= VETH_STATE_RESET;
517 veth_kick_statemachine(cnx);
518 }
519 spin_unlock_irqrestore(&cnx->lock, flags);
520 }
521
522 static void veth_handle_ack(struct veth_lpevent *event)
523 {
524 HvLpIndex rlp = event->base_event.xTargetLp;
525 struct veth_lpar_connection *cnx = veth_cnx[rlp];
526
527 BUG_ON(! cnx);
528
529 switch (event->base_event.xSubtype) {
530 case VETH_EVENT_CAP:
531 veth_take_cap_ack(cnx, event);
532 break;
533 case VETH_EVENT_MONITOR:
534 veth_take_monitor_ack(cnx, event);
535 break;
536 default:
537 veth_error("Unknown ack type %d from LPAR %d.\n",
538 event->base_event.xSubtype, rlp);
539 };
540 }
541
542 static void veth_handle_int(struct veth_lpevent *event)
543 {
544 HvLpIndex rlp = event->base_event.xSourceLp;
545 struct veth_lpar_connection *cnx = veth_cnx[rlp];
546 unsigned long flags;
547 int i, acked = 0;
548
549 BUG_ON(! cnx);
550
551 switch (event->base_event.xSubtype) {
552 case VETH_EVENT_CAP:
553 veth_take_cap(cnx, event);
554 break;
555 case VETH_EVENT_MONITOR:
556 /* do nothing... this'll hang out here til we're dead,
557 * and the hypervisor will return it for us. */
558 break;
559 case VETH_EVENT_FRAMES_ACK:
560 spin_lock_irqsave(&cnx->lock, flags);
561
562 for (i = 0; i < VETH_MAX_ACKS_PER_MSG; ++i) {
563 u16 msgnum = event->u.frames_ack_data.token[i];
564
565 if (msgnum < VETH_NUMBUFFERS) {
566 veth_recycle_msg(cnx, cnx->msgs + msgnum);
567 cnx->outstanding_tx--;
568 acked++;
569 }
570 }
571
572 if (acked > 0) {
573 cnx->last_contact = jiffies;
574 veth_wake_queues(cnx);
575 }
576
577 spin_unlock_irqrestore(&cnx->lock, flags);
578 break;
579 case VETH_EVENT_FRAMES:
580 veth_receive(cnx, event);
581 break;
582 default:
583 veth_error("Unknown interrupt type %d from LPAR %d.\n",
584 event->base_event.xSubtype, rlp);
585 };
586 }
587
588 static void veth_handle_event(struct HvLpEvent *event)
589 {
590 struct veth_lpevent *veth_event = (struct veth_lpevent *)event;
591
592 if (hvlpevent_is_ack(event))
593 veth_handle_ack(veth_event);
594 else
595 veth_handle_int(veth_event);
596 }
597
598 static int veth_process_caps(struct veth_lpar_connection *cnx)
599 {
600 struct veth_cap_data *remote_caps = &cnx->remote_caps;
601 int num_acks_needed;
602
603 /* Convert timer to jiffies */
604 cnx->ack_timeout = remote_caps->ack_timeout * HZ / 1000000;
605
606 if ( (remote_caps->num_buffers == 0)
607 || (remote_caps->ack_threshold > VETH_MAX_ACKS_PER_MSG)
608 || (remote_caps->ack_threshold == 0)
609 || (cnx->ack_timeout == 0) ) {
610 veth_error("Received incompatible capabilities from LPAR %d.\n",
611 cnx->remote_lp);
612 return HvLpEvent_Rc_InvalidSubtypeData;
613 }
614
615 num_acks_needed = (remote_caps->num_buffers
616 / remote_caps->ack_threshold) + 1;
617
618 /* FIXME: locking on num_ack_events? */
619 if (cnx->num_ack_events < num_acks_needed) {
620 int num;
621
622 num = veth_allocate_events(cnx->remote_lp,
623 num_acks_needed-cnx->num_ack_events);
624 if (num > 0)
625 cnx->num_ack_events += num;
626
627 if (cnx->num_ack_events < num_acks_needed) {
628 veth_error("Couldn't allocate enough ack events "
629 "for LPAR %d.\n", cnx->remote_lp);
630
631 return HvLpEvent_Rc_BufferNotAvailable;
632 }
633 }
634
635
636 return HvLpEvent_Rc_Good;
637 }
638
639 /* FIXME: The gotos here are a bit dubious */
640 static void veth_statemachine(struct work_struct *work)
641 {
642 struct veth_lpar_connection *cnx =
643 container_of(work, struct veth_lpar_connection,
644 statemachine_wq.work);
645 int rlp = cnx->remote_lp;
646 int rc;
647
648 spin_lock_irq(&cnx->lock);
649
650 restart:
651 if (cnx->state & VETH_STATE_RESET) {
652 if (cnx->state & VETH_STATE_OPEN)
653 HvCallEvent_closeLpEventPath(cnx->remote_lp,
654 HvLpEvent_Type_VirtualLan);
655
656 /*
657 * Reset ack data. This prevents the ack_timer actually
658 * doing anything, even if it runs one more time when
659 * we drop the lock below.
660 */
661 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
662 cnx->num_pending_acks = 0;
663
664 cnx->state &= ~(VETH_STATE_RESET | VETH_STATE_SENTMON
665 | VETH_STATE_OPEN | VETH_STATE_SENTCAPS
666 | VETH_STATE_GOTCAPACK | VETH_STATE_GOTCAPS
667 | VETH_STATE_SENTCAPACK | VETH_STATE_READY);
668
669 /* Clean up any leftover messages */
670 if (cnx->msgs) {
671 int i;
672 for (i = 0; i < VETH_NUMBUFFERS; ++i)
673 veth_recycle_msg(cnx, cnx->msgs + i);
674 }
675
676 cnx->outstanding_tx = 0;
677 veth_wake_queues(cnx);
678
679 /* Drop the lock so we can do stuff that might sleep or
680 * take other locks. */
681 spin_unlock_irq(&cnx->lock);
682
683 del_timer_sync(&cnx->ack_timer);
684 del_timer_sync(&cnx->reset_timer);
685
686 spin_lock_irq(&cnx->lock);
687
688 if (cnx->state & VETH_STATE_RESET)
689 goto restart;
690
691 /* Hack, wait for the other end to reset itself. */
692 if (! (cnx->state & VETH_STATE_SHUTDOWN)) {
693 schedule_delayed_work(&cnx->statemachine_wq, 5 * HZ);
694 goto out;
695 }
696 }
697
698 if (cnx->state & VETH_STATE_SHUTDOWN)
699 /* It's all over, do nothing */
700 goto out;
701
702 if ( !(cnx->state & VETH_STATE_OPEN) ) {
703 if (! cnx->msgs || (cnx->num_events < (2 + VETH_NUMBUFFERS)) )
704 goto cant_cope;
705
706 HvCallEvent_openLpEventPath(rlp, HvLpEvent_Type_VirtualLan);
707 cnx->src_inst =
708 HvCallEvent_getSourceLpInstanceId(rlp,
709 HvLpEvent_Type_VirtualLan);
710 cnx->dst_inst =
711 HvCallEvent_getTargetLpInstanceId(rlp,
712 HvLpEvent_Type_VirtualLan);
713 cnx->state |= VETH_STATE_OPEN;
714 }
715
716 if ( (cnx->state & VETH_STATE_OPEN)
717 && !(cnx->state & VETH_STATE_SENTMON) ) {
718 rc = veth_signalevent(cnx, VETH_EVENT_MONITOR,
719 HvLpEvent_AckInd_DoAck,
720 HvLpEvent_AckType_DeferredAck,
721 0, 0, 0, 0, 0, 0);
722
723 if (rc == HvLpEvent_Rc_Good) {
724 cnx->state |= VETH_STATE_SENTMON;
725 } else {
726 if ( (rc != HvLpEvent_Rc_PartitionDead)
727 && (rc != HvLpEvent_Rc_PathClosed) )
728 veth_error("Error sending monitor to LPAR %d, "
729 "rc = %d\n", rlp, rc);
730
731 /* Oh well, hope we get a cap from the other
732 * end and do better when that kicks us */
733 goto out;
734 }
735 }
736
737 if ( (cnx->state & VETH_STATE_OPEN)
738 && !(cnx->state & VETH_STATE_SENTCAPS)) {
739 u64 *rawcap = (u64 *)&cnx->local_caps;
740
741 rc = veth_signalevent(cnx, VETH_EVENT_CAP,
742 HvLpEvent_AckInd_DoAck,
743 HvLpEvent_AckType_ImmediateAck,
744 0, rawcap[0], rawcap[1], rawcap[2],
745 rawcap[3], rawcap[4]);
746
747 if (rc == HvLpEvent_Rc_Good) {
748 cnx->state |= VETH_STATE_SENTCAPS;
749 } else {
750 if ( (rc != HvLpEvent_Rc_PartitionDead)
751 && (rc != HvLpEvent_Rc_PathClosed) )
752 veth_error("Error sending caps to LPAR %d, "
753 "rc = %d\n", rlp, rc);
754
755 /* Oh well, hope we get a cap from the other
756 * end and do better when that kicks us */
757 goto out;
758 }
759 }
760
761 if ((cnx->state & VETH_STATE_GOTCAPS)
762 && !(cnx->state & VETH_STATE_SENTCAPACK)) {
763 struct veth_cap_data *remote_caps = &cnx->remote_caps;
764
765 memcpy(remote_caps, &cnx->cap_event.u.caps_data,
766 sizeof(*remote_caps));
767
768 spin_unlock_irq(&cnx->lock);
769 rc = veth_process_caps(cnx);
770 spin_lock_irq(&cnx->lock);
771
772 /* We dropped the lock, so recheck for anything which
773 * might mess us up */
774 if (cnx->state & (VETH_STATE_RESET|VETH_STATE_SHUTDOWN))
775 goto restart;
776
777 cnx->cap_event.base_event.xRc = rc;
778 HvCallEvent_ackLpEvent((struct HvLpEvent *)&cnx->cap_event);
779 if (rc == HvLpEvent_Rc_Good)
780 cnx->state |= VETH_STATE_SENTCAPACK;
781 else
782 goto cant_cope;
783 }
784
785 if ((cnx->state & VETH_STATE_GOTCAPACK)
786 && (cnx->state & VETH_STATE_GOTCAPS)
787 && !(cnx->state & VETH_STATE_READY)) {
788 if (cnx->cap_ack_event.base_event.xRc == HvLpEvent_Rc_Good) {
789 /* Start the ACK timer */
790 cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
791 add_timer(&cnx->ack_timer);
792 cnx->state |= VETH_STATE_READY;
793 } else {
794 veth_error("Caps rejected by LPAR %d, rc = %d\n",
795 rlp, cnx->cap_ack_event.base_event.xRc);
796 goto cant_cope;
797 }
798 }
799
800 out:
801 spin_unlock_irq(&cnx->lock);
802 return;
803
804 cant_cope:
805 /* FIXME: we get here if something happens we really can't
806 * cope with. The link will never work once we get here, and
807 * all we can do is not lock the rest of the system up */
808 veth_error("Unrecoverable error on connection to LPAR %d, shutting down"
809 " (state = 0x%04lx)\n", rlp, cnx->state);
810 cnx->state |= VETH_STATE_SHUTDOWN;
811 spin_unlock_irq(&cnx->lock);
812 }
813
814 static int veth_init_connection(u8 rlp)
815 {
816 struct veth_lpar_connection *cnx;
817 struct veth_msg *msgs;
818 int i, rc;
819
820 if ( (rlp == this_lp)
821 || ! HvLpConfig_doLpsCommunicateOnVirtualLan(this_lp, rlp) )
822 return 0;
823
824 cnx = kzalloc(sizeof(*cnx), GFP_KERNEL);
825 if (! cnx)
826 return -ENOMEM;
827
828 cnx->remote_lp = rlp;
829 spin_lock_init(&cnx->lock);
830 INIT_DELAYED_WORK(&cnx->statemachine_wq, veth_statemachine);
831
832 init_timer(&cnx->ack_timer);
833 cnx->ack_timer.function = veth_timed_ack;
834 cnx->ack_timer.data = (unsigned long) cnx;
835
836 init_timer(&cnx->reset_timer);
837 cnx->reset_timer.function = veth_timed_reset;
838 cnx->reset_timer.data = (unsigned long) cnx;
839 cnx->reset_timeout = 5 * HZ * (VETH_ACKTIMEOUT / 1000000);
840
841 memset(&cnx->pending_acks, 0xff, sizeof (cnx->pending_acks));
842
843 veth_cnx[rlp] = cnx;
844
845 /* This gets us 1 reference, which is held on behalf of the driver
846 * infrastructure. It's released at module unload. */
847 kobject_init(&cnx->kobject);
848 cnx->kobject.ktype = &veth_lpar_connection_ktype;
849 rc = kobject_set_name(&cnx->kobject, "cnx%.2d", rlp);
850 if (rc != 0)
851 return rc;
852
853 msgs = kcalloc(VETH_NUMBUFFERS, sizeof(struct veth_msg), GFP_KERNEL);
854 if (! msgs) {
855 veth_error("Can't allocate buffers for LPAR %d.\n", rlp);
856 return -ENOMEM;
857 }
858
859 cnx->msgs = msgs;
860
861 for (i = 0; i < VETH_NUMBUFFERS; i++) {
862 msgs[i].token = i;
863 veth_stack_push(cnx, msgs + i);
864 }
865
866 cnx->num_events = veth_allocate_events(rlp, 2 + VETH_NUMBUFFERS);
867
868 if (cnx->num_events < (2 + VETH_NUMBUFFERS)) {
869 veth_error("Can't allocate enough events for LPAR %d.\n", rlp);
870 return -ENOMEM;
871 }
872
873 cnx->local_caps.num_buffers = VETH_NUMBUFFERS;
874 cnx->local_caps.ack_threshold = ACK_THRESHOLD;
875 cnx->local_caps.ack_timeout = VETH_ACKTIMEOUT;
876
877 return 0;
878 }
879
880 static void veth_stop_connection(struct veth_lpar_connection *cnx)
881 {
882 if (!cnx)
883 return;
884
885 spin_lock_irq(&cnx->lock);
886 cnx->state |= VETH_STATE_RESET | VETH_STATE_SHUTDOWN;
887 veth_kick_statemachine(cnx);
888 spin_unlock_irq(&cnx->lock);
889
890 /* There's a slim chance the reset code has just queued the
891 * statemachine to run in five seconds. If so we need to cancel
892 * that and requeue the work to run now. */
893 if (cancel_delayed_work(&cnx->statemachine_wq)) {
894 spin_lock_irq(&cnx->lock);
895 veth_kick_statemachine(cnx);
896 spin_unlock_irq(&cnx->lock);
897 }
898
899 /* Wait for the state machine to run. */
900 flush_scheduled_work();
901 }
902
903 static void veth_destroy_connection(struct veth_lpar_connection *cnx)
904 {
905 if (!cnx)
906 return;
907
908 if (cnx->num_events > 0)
909 mf_deallocate_lp_events(cnx->remote_lp,
910 HvLpEvent_Type_VirtualLan,
911 cnx->num_events,
912 NULL, NULL);
913 if (cnx->num_ack_events > 0)
914 mf_deallocate_lp_events(cnx->remote_lp,
915 HvLpEvent_Type_VirtualLan,
916 cnx->num_ack_events,
917 NULL, NULL);
918
919 kfree(cnx->msgs);
920 veth_cnx[cnx->remote_lp] = NULL;
921 kfree(cnx);
922 }
923
924 static void veth_release_connection(struct kobject *kobj)
925 {
926 struct veth_lpar_connection *cnx;
927 cnx = container_of(kobj, struct veth_lpar_connection, kobject);
928 veth_stop_connection(cnx);
929 veth_destroy_connection(cnx);
930 }
931
932 /*
933 * net_device code
934 */
935
936 static int veth_open(struct net_device *dev)
937 {
938 netif_start_queue(dev);
939 return 0;
940 }
941
942 static int veth_close(struct net_device *dev)
943 {
944 netif_stop_queue(dev);
945 return 0;
946 }
947
948 static int veth_change_mtu(struct net_device *dev, int new_mtu)
949 {
950 if ((new_mtu < 68) || (new_mtu > VETH_MAX_MTU))
951 return -EINVAL;
952 dev->mtu = new_mtu;
953 return 0;
954 }
955
956 static void veth_set_multicast_list(struct net_device *dev)
957 {
958 struct veth_port *port = (struct veth_port *) dev->priv;
959 unsigned long flags;
960
961 write_lock_irqsave(&port->mcast_gate, flags);
962
963 if ((dev->flags & IFF_PROMISC) || (dev->flags & IFF_ALLMULTI) ||
964 (dev->mc_count > VETH_MAX_MCAST)) {
965 port->promiscuous = 1;
966 } else {
967 struct dev_mc_list *dmi = dev->mc_list;
968 int i;
969
970 port->promiscuous = 0;
971
972 /* Update table */
973 port->num_mcast = 0;
974
975 for (i = 0; i < dev->mc_count; i++) {
976 u8 *addr = dmi->dmi_addr;
977 u64 xaddr = 0;
978
979 if (addr[0] & 0x01) {/* multicast address? */
980 memcpy(&xaddr, addr, ETH_ALEN);
981 port->mcast_addr[port->num_mcast] = xaddr;
982 port->num_mcast++;
983 }
984 dmi = dmi->next;
985 }
986 }
987
988 write_unlock_irqrestore(&port->mcast_gate, flags);
989 }
990
991 static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
992 {
993 strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
994 info->driver[sizeof(info->driver) - 1] = '\0';
995 strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
996 info->version[sizeof(info->version) - 1] = '\0';
997 }
998
999 static int veth_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
1000 {
1001 ecmd->supported = (SUPPORTED_1000baseT_Full
1002 | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1003 ecmd->advertising = (SUPPORTED_1000baseT_Full
1004 | SUPPORTED_Autoneg | SUPPORTED_FIBRE);
1005 ecmd->port = PORT_FIBRE;
1006 ecmd->transceiver = XCVR_INTERNAL;
1007 ecmd->phy_address = 0;
1008 ecmd->speed = SPEED_1000;
1009 ecmd->duplex = DUPLEX_FULL;
1010 ecmd->autoneg = AUTONEG_ENABLE;
1011 ecmd->maxtxpkt = 120;
1012 ecmd->maxrxpkt = 120;
1013 return 0;
1014 }
1015
1016 static u32 veth_get_link(struct net_device *dev)
1017 {
1018 return 1;
1019 }
1020
1021 static const struct ethtool_ops ops = {
1022 .get_drvinfo = veth_get_drvinfo,
1023 .get_settings = veth_get_settings,
1024 .get_link = veth_get_link,
1025 };
1026
1027 static struct net_device * __init veth_probe_one(int vlan,
1028 struct vio_dev *vio_dev)
1029 {
1030 struct net_device *dev;
1031 struct veth_port *port;
1032 struct device *vdev = &vio_dev->dev;
1033 int i, rc;
1034 const unsigned char *mac_addr;
1035
1036 mac_addr = vio_get_attribute(vio_dev, "local-mac-address", NULL);
1037 if (mac_addr == NULL)
1038 mac_addr = vio_get_attribute(vio_dev, "mac-address", NULL);
1039 if (mac_addr == NULL) {
1040 veth_error("Unable to fetch MAC address from device tree.\n");
1041 return NULL;
1042 }
1043
1044 dev = alloc_etherdev(sizeof (struct veth_port));
1045 if (! dev) {
1046 veth_error("Unable to allocate net_device structure!\n");
1047 return NULL;
1048 }
1049
1050 port = (struct veth_port *) dev->priv;
1051
1052 spin_lock_init(&port->queue_lock);
1053 rwlock_init(&port->mcast_gate);
1054 port->stopped_map = 0;
1055
1056 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1057 HvLpVirtualLanIndexMap map;
1058
1059 if (i == this_lp)
1060 continue;
1061 map = HvLpConfig_getVirtualLanIndexMapForLp(i);
1062 if (map & (0x8000 >> vlan))
1063 port->lpar_map |= (1 << i);
1064 }
1065 port->dev = vdev;
1066
1067 memcpy(dev->dev_addr, mac_addr, ETH_ALEN);
1068
1069 dev->mtu = VETH_MAX_MTU;
1070
1071 memcpy(&port->mac_addr, mac_addr, ETH_ALEN);
1072
1073 dev->open = veth_open;
1074 dev->hard_start_xmit = veth_start_xmit;
1075 dev->stop = veth_close;
1076 dev->change_mtu = veth_change_mtu;
1077 dev->set_mac_address = NULL;
1078 dev->set_multicast_list = veth_set_multicast_list;
1079 SET_ETHTOOL_OPS(dev, &ops);
1080
1081 SET_NETDEV_DEV(dev, vdev);
1082
1083 rc = register_netdev(dev);
1084 if (rc != 0) {
1085 veth_error("Failed registering net device for vlan%d.\n", vlan);
1086 free_netdev(dev);
1087 return NULL;
1088 }
1089
1090 kobject_init(&port->kobject);
1091 port->kobject.parent = &dev->dev.kobj;
1092 port->kobject.ktype = &veth_port_ktype;
1093 kobject_set_name(&port->kobject, "veth_port");
1094 if (0 != kobject_add(&port->kobject))
1095 veth_error("Failed adding port for %s to sysfs.\n", dev->name);
1096
1097 veth_info("%s attached to iSeries vlan %d (LPAR map = 0x%.4X)\n",
1098 dev->name, vlan, port->lpar_map);
1099
1100 return dev;
1101 }
1102
1103 /*
1104 * Tx path
1105 */
1106
1107 static int veth_transmit_to_one(struct sk_buff *skb, HvLpIndex rlp,
1108 struct net_device *dev)
1109 {
1110 struct veth_lpar_connection *cnx = veth_cnx[rlp];
1111 struct veth_port *port = (struct veth_port *) dev->priv;
1112 HvLpEvent_Rc rc;
1113 struct veth_msg *msg = NULL;
1114 unsigned long flags;
1115
1116 if (! cnx)
1117 return 0;
1118
1119 spin_lock_irqsave(&cnx->lock, flags);
1120
1121 if (! (cnx->state & VETH_STATE_READY))
1122 goto no_error;
1123
1124 if ((skb->len - ETH_HLEN) > VETH_MAX_MTU)
1125 goto drop;
1126
1127 msg = veth_stack_pop(cnx);
1128 if (! msg)
1129 goto drop;
1130
1131 msg->in_use = 1;
1132 msg->skb = skb_get(skb);
1133
1134 msg->data.addr[0] = dma_map_single(port->dev, skb->data,
1135 skb->len, DMA_TO_DEVICE);
1136
1137 if (dma_mapping_error(msg->data.addr[0]))
1138 goto recycle_and_drop;
1139
1140 msg->dev = port->dev;
1141 msg->data.len[0] = skb->len;
1142 msg->data.eofmask = 1 << VETH_EOF_SHIFT;
1143
1144 rc = veth_signaldata(cnx, VETH_EVENT_FRAMES, msg->token, &msg->data);
1145
1146 if (rc != HvLpEvent_Rc_Good)
1147 goto recycle_and_drop;
1148
1149 /* If the timer's not already running, start it now. */
1150 if (0 == cnx->outstanding_tx)
1151 mod_timer(&cnx->reset_timer, jiffies + cnx->reset_timeout);
1152
1153 cnx->last_contact = jiffies;
1154 cnx->outstanding_tx++;
1155
1156 if (veth_stack_is_empty(cnx))
1157 veth_stop_queues(cnx);
1158
1159 no_error:
1160 spin_unlock_irqrestore(&cnx->lock, flags);
1161 return 0;
1162
1163 recycle_and_drop:
1164 veth_recycle_msg(cnx, msg);
1165 drop:
1166 spin_unlock_irqrestore(&cnx->lock, flags);
1167 return 1;
1168 }
1169
1170 static void veth_transmit_to_many(struct sk_buff *skb,
1171 HvLpIndexMap lpmask,
1172 struct net_device *dev)
1173 {
1174 int i, success, error;
1175
1176 success = error = 0;
1177
1178 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1179 if ((lpmask & (1 << i)) == 0)
1180 continue;
1181
1182 if (veth_transmit_to_one(skb, i, dev))
1183 error = 1;
1184 else
1185 success = 1;
1186 }
1187
1188 if (error)
1189 dev->stats.tx_errors++;
1190
1191 if (success) {
1192 dev->stats.tx_packets++;
1193 dev->stats.tx_bytes += skb->len;
1194 }
1195 }
1196
1197 static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
1198 {
1199 unsigned char *frame = skb->data;
1200 struct veth_port *port = (struct veth_port *) dev->priv;
1201 HvLpIndexMap lpmask;
1202
1203 if (! (frame[0] & 0x01)) {
1204 /* unicast packet */
1205 HvLpIndex rlp = frame[5];
1206
1207 if ( ! ((1 << rlp) & port->lpar_map) ) {
1208 dev_kfree_skb(skb);
1209 return 0;
1210 }
1211
1212 lpmask = 1 << rlp;
1213 } else {
1214 lpmask = port->lpar_map;
1215 }
1216
1217 veth_transmit_to_many(skb, lpmask, dev);
1218
1219 dev_kfree_skb(skb);
1220
1221 return 0;
1222 }
1223
1224 /* You must hold the connection's lock when you call this function. */
1225 static void veth_recycle_msg(struct veth_lpar_connection *cnx,
1226 struct veth_msg *msg)
1227 {
1228 u32 dma_address, dma_length;
1229
1230 if (msg->in_use) {
1231 msg->in_use = 0;
1232 dma_address = msg->data.addr[0];
1233 dma_length = msg->data.len[0];
1234
1235 if (!dma_mapping_error(dma_address))
1236 dma_unmap_single(msg->dev, dma_address, dma_length,
1237 DMA_TO_DEVICE);
1238
1239 if (msg->skb) {
1240 dev_kfree_skb_any(msg->skb);
1241 msg->skb = NULL;
1242 }
1243
1244 memset(&msg->data, 0, sizeof(msg->data));
1245 veth_stack_push(cnx, msg);
1246 } else if (cnx->state & VETH_STATE_OPEN) {
1247 veth_error("Non-pending frame (# %d) acked by LPAR %d.\n",
1248 cnx->remote_lp, msg->token);
1249 }
1250 }
1251
1252 static void veth_wake_queues(struct veth_lpar_connection *cnx)
1253 {
1254 int i;
1255
1256 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1257 struct net_device *dev = veth_dev[i];
1258 struct veth_port *port;
1259 unsigned long flags;
1260
1261 if (! dev)
1262 continue;
1263
1264 port = (struct veth_port *)dev->priv;
1265
1266 if (! (port->lpar_map & (1<<cnx->remote_lp)))
1267 continue;
1268
1269 spin_lock_irqsave(&port->queue_lock, flags);
1270
1271 port->stopped_map &= ~(1 << cnx->remote_lp);
1272
1273 if (0 == port->stopped_map && netif_queue_stopped(dev)) {
1274 veth_debug("cnx %d: woke queue for %s.\n",
1275 cnx->remote_lp, dev->name);
1276 netif_wake_queue(dev);
1277 }
1278 spin_unlock_irqrestore(&port->queue_lock, flags);
1279 }
1280 }
1281
1282 static void veth_stop_queues(struct veth_lpar_connection *cnx)
1283 {
1284 int i;
1285
1286 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
1287 struct net_device *dev = veth_dev[i];
1288 struct veth_port *port;
1289
1290 if (! dev)
1291 continue;
1292
1293 port = (struct veth_port *)dev->priv;
1294
1295 /* If this cnx is not on the vlan for this port, continue */
1296 if (! (port->lpar_map & (1 << cnx->remote_lp)))
1297 continue;
1298
1299 spin_lock(&port->queue_lock);
1300
1301 netif_stop_queue(dev);
1302 port->stopped_map |= (1 << cnx->remote_lp);
1303
1304 veth_debug("cnx %d: stopped queue for %s, map = 0x%x.\n",
1305 cnx->remote_lp, dev->name, port->stopped_map);
1306
1307 spin_unlock(&port->queue_lock);
1308 }
1309 }
1310
1311 static void veth_timed_reset(unsigned long ptr)
1312 {
1313 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *)ptr;
1314 unsigned long trigger_time, flags;
1315
1316 /* FIXME is it possible this fires after veth_stop_connection()?
1317 * That would reschedule the statemachine for 5 seconds and probably
1318 * execute it after the module's been unloaded. Hmm. */
1319
1320 spin_lock_irqsave(&cnx->lock, flags);
1321
1322 if (cnx->outstanding_tx > 0) {
1323 trigger_time = cnx->last_contact + cnx->reset_timeout;
1324
1325 if (trigger_time < jiffies) {
1326 cnx->state |= VETH_STATE_RESET;
1327 veth_kick_statemachine(cnx);
1328 veth_error("%d packets not acked by LPAR %d within %d "
1329 "seconds, resetting.\n",
1330 cnx->outstanding_tx, cnx->remote_lp,
1331 cnx->reset_timeout / HZ);
1332 } else {
1333 /* Reschedule the timer */
1334 trigger_time = jiffies + cnx->reset_timeout;
1335 mod_timer(&cnx->reset_timer, trigger_time);
1336 }
1337 }
1338
1339 spin_unlock_irqrestore(&cnx->lock, flags);
1340 }
1341
1342 /*
1343 * Rx path
1344 */
1345
1346 static inline int veth_frame_wanted(struct veth_port *port, u64 mac_addr)
1347 {
1348 int wanted = 0;
1349 int i;
1350 unsigned long flags;
1351
1352 if ( (mac_addr == port->mac_addr) || (mac_addr == 0xffffffffffff0000) )
1353 return 1;
1354
1355 read_lock_irqsave(&port->mcast_gate, flags);
1356
1357 if (port->promiscuous) {
1358 wanted = 1;
1359 goto out;
1360 }
1361
1362 for (i = 0; i < port->num_mcast; ++i) {
1363 if (port->mcast_addr[i] == mac_addr) {
1364 wanted = 1;
1365 break;
1366 }
1367 }
1368
1369 out:
1370 read_unlock_irqrestore(&port->mcast_gate, flags);
1371
1372 return wanted;
1373 }
1374
1375 struct dma_chunk {
1376 u64 addr;
1377 u64 size;
1378 };
1379
1380 #define VETH_MAX_PAGES_PER_FRAME ( (VETH_MAX_MTU+PAGE_SIZE-2)/PAGE_SIZE + 1 )
1381
1382 static inline void veth_build_dma_list(struct dma_chunk *list,
1383 unsigned char *p, unsigned long length)
1384 {
1385 unsigned long done;
1386 int i = 1;
1387
1388 /* FIXME: skbs are continguous in real addresses. Do we
1389 * really need to break it into PAGE_SIZE chunks, or can we do
1390 * it just at the granularity of iSeries real->absolute
1391 * mapping? Indeed, given the way the allocator works, can we
1392 * count on them being absolutely contiguous? */
1393 list[0].addr = iseries_hv_addr(p);
1394 list[0].size = min(length,
1395 PAGE_SIZE - ((unsigned long)p & ~PAGE_MASK));
1396
1397 done = list[0].size;
1398 while (done < length) {
1399 list[i].addr = iseries_hv_addr(p + done);
1400 list[i].size = min(length-done, PAGE_SIZE);
1401 done += list[i].size;
1402 i++;
1403 }
1404 }
1405
1406 static void veth_flush_acks(struct veth_lpar_connection *cnx)
1407 {
1408 HvLpEvent_Rc rc;
1409
1410 rc = veth_signaldata(cnx, VETH_EVENT_FRAMES_ACK,
1411 0, &cnx->pending_acks);
1412
1413 if (rc != HvLpEvent_Rc_Good)
1414 veth_error("Failed acking frames from LPAR %d, rc = %d\n",
1415 cnx->remote_lp, (int)rc);
1416
1417 cnx->num_pending_acks = 0;
1418 memset(&cnx->pending_acks, 0xff, sizeof(cnx->pending_acks));
1419 }
1420
1421 static void veth_receive(struct veth_lpar_connection *cnx,
1422 struct veth_lpevent *event)
1423 {
1424 struct veth_frames_data *senddata = &event->u.frames_data;
1425 int startchunk = 0;
1426 int nchunks;
1427 unsigned long flags;
1428 HvLpDma_Rc rc;
1429
1430 do {
1431 u16 length = 0;
1432 struct sk_buff *skb;
1433 struct dma_chunk local_list[VETH_MAX_PAGES_PER_FRAME];
1434 struct dma_chunk remote_list[VETH_MAX_FRAMES_PER_MSG];
1435 u64 dest;
1436 HvLpVirtualLanIndex vlan;
1437 struct net_device *dev;
1438 struct veth_port *port;
1439
1440 /* FIXME: do we need this? */
1441 memset(local_list, 0, sizeof(local_list));
1442 memset(remote_list, 0, sizeof(VETH_MAX_FRAMES_PER_MSG));
1443
1444 /* a 0 address marks the end of the valid entries */
1445 if (senddata->addr[startchunk] == 0)
1446 break;
1447
1448 /* make sure that we have at least 1 EOF entry in the
1449 * remaining entries */
1450 if (! (senddata->eofmask >> (startchunk + VETH_EOF_SHIFT))) {
1451 veth_error("Missing EOF fragment in event "
1452 "eofmask = 0x%x startchunk = %d\n",
1453 (unsigned)senddata->eofmask,
1454 startchunk);
1455 break;
1456 }
1457
1458 /* build list of chunks in this frame */
1459 nchunks = 0;
1460 do {
1461 remote_list[nchunks].addr =
1462 (u64) senddata->addr[startchunk+nchunks] << 32;
1463 remote_list[nchunks].size =
1464 senddata->len[startchunk+nchunks];
1465 length += remote_list[nchunks].size;
1466 } while (! (senddata->eofmask &
1467 (1 << (VETH_EOF_SHIFT + startchunk + nchunks++))));
1468
1469 /* length == total length of all chunks */
1470 /* nchunks == # of chunks in this frame */
1471
1472 if ((length - ETH_HLEN) > VETH_MAX_MTU) {
1473 veth_error("Received oversize frame from LPAR %d "
1474 "(length = %d)\n",
1475 cnx->remote_lp, length);
1476 continue;
1477 }
1478
1479 skb = alloc_skb(length, GFP_ATOMIC);
1480 if (!skb)
1481 continue;
1482
1483 veth_build_dma_list(local_list, skb->data, length);
1484
1485 rc = HvCallEvent_dmaBufList(HvLpEvent_Type_VirtualLan,
1486 event->base_event.xSourceLp,
1487 HvLpDma_Direction_RemoteToLocal,
1488 cnx->src_inst,
1489 cnx->dst_inst,
1490 HvLpDma_AddressType_RealAddress,
1491 HvLpDma_AddressType_TceIndex,
1492 iseries_hv_addr(&local_list),
1493 iseries_hv_addr(&remote_list),
1494 length);
1495 if (rc != HvLpDma_Rc_Good) {
1496 dev_kfree_skb_irq(skb);
1497 continue;
1498 }
1499
1500 vlan = skb->data[9];
1501 dev = veth_dev[vlan];
1502 if (! dev) {
1503 /*
1504 * Some earlier versions of the driver sent
1505 * broadcasts down all connections, even to lpars
1506 * that weren't on the relevant vlan. So ignore
1507 * packets belonging to a vlan we're not on.
1508 * We can also be here if we receive packets while
1509 * the driver is going down, because then dev is NULL.
1510 */
1511 dev_kfree_skb_irq(skb);
1512 continue;
1513 }
1514
1515 port = (struct veth_port *)dev->priv;
1516 dest = *((u64 *) skb->data) & 0xFFFFFFFFFFFF0000;
1517
1518 if ((vlan > HVMAXARCHITECTEDVIRTUALLANS) || !port) {
1519 dev_kfree_skb_irq(skb);
1520 continue;
1521 }
1522 if (! veth_frame_wanted(port, dest)) {
1523 dev_kfree_skb_irq(skb);
1524 continue;
1525 }
1526
1527 skb_put(skb, length);
1528 skb->protocol = eth_type_trans(skb, dev);
1529 skb->ip_summed = CHECKSUM_NONE;
1530 netif_rx(skb); /* send it up */
1531 dev->stats.rx_packets++;
1532 dev->stats.rx_bytes += length;
1533 } while (startchunk += nchunks, startchunk < VETH_MAX_FRAMES_PER_MSG);
1534
1535 /* Ack it */
1536 spin_lock_irqsave(&cnx->lock, flags);
1537 BUG_ON(cnx->num_pending_acks > VETH_MAX_ACKS_PER_MSG);
1538
1539 cnx->pending_acks[cnx->num_pending_acks++] =
1540 event->base_event.xCorrelationToken;
1541
1542 if ( (cnx->num_pending_acks >= cnx->remote_caps.ack_threshold)
1543 || (cnx->num_pending_acks >= VETH_MAX_ACKS_PER_MSG) )
1544 veth_flush_acks(cnx);
1545
1546 spin_unlock_irqrestore(&cnx->lock, flags);
1547 }
1548
1549 static void veth_timed_ack(unsigned long ptr)
1550 {
1551 struct veth_lpar_connection *cnx = (struct veth_lpar_connection *) ptr;
1552 unsigned long flags;
1553
1554 /* Ack all the events */
1555 spin_lock_irqsave(&cnx->lock, flags);
1556 if (cnx->num_pending_acks > 0)
1557 veth_flush_acks(cnx);
1558
1559 /* Reschedule the timer */
1560 cnx->ack_timer.expires = jiffies + cnx->ack_timeout;
1561 add_timer(&cnx->ack_timer);
1562 spin_unlock_irqrestore(&cnx->lock, flags);
1563 }
1564
1565 static int veth_remove(struct vio_dev *vdev)
1566 {
1567 struct veth_lpar_connection *cnx;
1568 struct net_device *dev;
1569 struct veth_port *port;
1570 int i;
1571
1572 dev = veth_dev[vdev->unit_address];
1573
1574 if (! dev)
1575 return 0;
1576
1577 port = netdev_priv(dev);
1578
1579 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1580 cnx = veth_cnx[i];
1581
1582 if (cnx && (port->lpar_map & (1 << i))) {
1583 /* Drop our reference to connections on our VLAN */
1584 kobject_put(&cnx->kobject);
1585 }
1586 }
1587
1588 veth_dev[vdev->unit_address] = NULL;
1589 kobject_del(&port->kobject);
1590 kobject_put(&port->kobject);
1591 unregister_netdev(dev);
1592 free_netdev(dev);
1593
1594 return 0;
1595 }
1596
1597 static int veth_probe(struct vio_dev *vdev, const struct vio_device_id *id)
1598 {
1599 int i = vdev->unit_address;
1600 struct net_device *dev;
1601 struct veth_port *port;
1602
1603 dev = veth_probe_one(i, vdev);
1604 if (dev == NULL) {
1605 veth_remove(vdev);
1606 return 1;
1607 }
1608 veth_dev[i] = dev;
1609
1610 port = (struct veth_port*)netdev_priv(dev);
1611
1612 /* Start the state machine on each connection on this vlan. If we're
1613 * the first dev to do so this will commence link negotiation */
1614 for (i = 0; i < HVMAXARCHITECTEDLPS; i++) {
1615 struct veth_lpar_connection *cnx;
1616
1617 if (! (port->lpar_map & (1 << i)))
1618 continue;
1619
1620 cnx = veth_cnx[i];
1621 if (!cnx)
1622 continue;
1623
1624 kobject_get(&cnx->kobject);
1625 veth_kick_statemachine(cnx);
1626 }
1627
1628 return 0;
1629 }
1630
1631 /**
1632 * veth_device_table: Used by vio.c to match devices that we
1633 * support.
1634 */
1635 static struct vio_device_id veth_device_table[] __devinitdata = {
1636 { "network", "IBM,iSeries-l-lan" },
1637 { "", "" }
1638 };
1639 MODULE_DEVICE_TABLE(vio, veth_device_table);
1640
1641 static struct vio_driver veth_driver = {
1642 .id_table = veth_device_table,
1643 .probe = veth_probe,
1644 .remove = veth_remove,
1645 .driver = {
1646 .name = DRV_NAME,
1647 .owner = THIS_MODULE,
1648 }
1649 };
1650
1651 /*
1652 * Module initialization/cleanup
1653 */
1654
1655 static void __exit veth_module_cleanup(void)
1656 {
1657 int i;
1658 struct veth_lpar_connection *cnx;
1659
1660 /* Disconnect our "irq" to stop events coming from the Hypervisor. */
1661 HvLpEvent_unregisterHandler(HvLpEvent_Type_VirtualLan);
1662
1663 /* Make sure any work queued from Hypervisor callbacks is finished. */
1664 flush_scheduled_work();
1665
1666 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1667 cnx = veth_cnx[i];
1668
1669 if (!cnx)
1670 continue;
1671
1672 /* Remove the connection from sysfs */
1673 kobject_del(&cnx->kobject);
1674 /* Drop the driver's reference to the connection */
1675 kobject_put(&cnx->kobject);
1676 }
1677
1678 /* Unregister the driver, which will close all the netdevs and stop
1679 * the connections when they're no longer referenced. */
1680 vio_unregister_driver(&veth_driver);
1681 }
1682 module_exit(veth_module_cleanup);
1683
1684 static int __init veth_module_init(void)
1685 {
1686 int i;
1687 int rc;
1688
1689 if (!firmware_has_feature(FW_FEATURE_ISERIES))
1690 return -ENODEV;
1691
1692 this_lp = HvLpConfig_getLpIndex_outline();
1693
1694 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1695 rc = veth_init_connection(i);
1696 if (rc != 0)
1697 goto error;
1698 }
1699
1700 HvLpEvent_registerHandler(HvLpEvent_Type_VirtualLan,
1701 &veth_handle_event);
1702
1703 rc = vio_register_driver(&veth_driver);
1704 if (rc != 0)
1705 goto error;
1706
1707 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1708 struct kobject *kobj;
1709
1710 if (!veth_cnx[i])
1711 continue;
1712
1713 kobj = &veth_cnx[i]->kobject;
1714 kobj->parent = &veth_driver.driver.kobj;
1715 /* If the add failes, complain but otherwise continue */
1716 if (0 != kobject_add(kobj))
1717 veth_error("cnx %d: Failed adding to sysfs.\n", i);
1718 }
1719
1720 return 0;
1721
1722 error:
1723 for (i = 0; i < HVMAXARCHITECTEDLPS; ++i) {
1724 veth_destroy_connection(veth_cnx[i]);
1725 }
1726
1727 return rc;
1728 }
1729 module_init(veth_module_init);
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